Economizer tube



Ap 16, 1929. w. scHRE'Rs ECONOII ZER TUBE Filed Aug'. 15, 1927 Patented Apr. 16, 1929.

WILLY soHRoERs, on KREFELD, GERMANY, 'ASSIGNOB To JOHANNES F KREFELD, GERMANY.

EGONOMIZER TUBE.

KLEINEWEFERS,

Application lled August 15, 1 927, Serial No. 2713,06?, and in Germany February 3, 1927.

The ordinary economizer tubes having a smooth inner surface and cast of one piece with integral external disclike ribs, are liable to easily break between said ribs due to 'the 5 high internal pressure existing in the tubes.

According to the invention, said drawback is overcome by arranging the integral external disclike ribs, each being composed of two segments at right angles to the longitu# dinal axisv of the tube withL a space leftbetween them, and joining on each side of the tube the ends of theI segments of saidqribs alternately in a regular succession by means of straight inclined walls which are also .in-

teg-ral with the tube and- Wi'th said ribs. Thereby, a single or double continuous fin is 4formed around the tube, whichstrengthens`- the latter on its whole length and reliably prevents a breaking thereof. y The accompanying drawing shows by way of example a preferred constructional form of the improved economizer tube; Figs. l and 2 are respectively a side v iew andan end view thereof. i

l The economizer tube a is cast in one with its external disclike ribs7 each being composed of two segments b, 0, which are arranged at right angles to the longitudinal axis of the tube with space left between them, while on each side of the tube the enisof the segments of said ribs are joined alternately in a regular: succession by means of straight lnclined walls d, e which are also cast in one with they tube and with said ribs, in such a way that a single or double" continuous fin is ,formed around the tube, for the purpose explained.

A main advantage of the invention is that the moulding and casting in one of the tube with` the straight i disclike ribs and their straight joiningwalls can be effected in a very easy manner.

` What I claim, is :#2 An integral rlbbed econonuzer tube having x L a smooth lnner straight external surface and comprising dlsehke rlbs, each being with the tube.

In testimony whereof I have hereunto set my hand.

WILLY scHRoERs. 

